forgot

src/client/misc.zig

@@ -0,0 +1,49 @@
+const rl = @import("raylib");
+
+const FPS_CAPTURE_FRAMES_COUNT : i32 = 30;      // 30 captures
+const FPS_AVERAGE_TIME_SECONDS : f32 = 0.5;     // 500 milliseconds
+const FPS_STEP                 : f32 = (FPS_AVERAGE_TIME_SECONDS / FPS_CAPTURE_FRAMES_COUNT);
+
+var index   : u32 = 0;
+var history : [FPS_CAPTURE_FRAMES_COUNT]f32 = .{0} ** FPS_CAPTURE_FRAMES_COUNT;
+var average : f32 = 0;
+var last    : f32 = 0;
+
+pub fn drawFPS(posX : i32, posY : i32, fpsFrame : f32, frame : i32) void {
+    var color : rl.Color = .lime;                // Good FPS
+    const fps : i32 = getFPS(fpsFrame, frame);
+
+    if ((fps < 30) and (fps >= 15)) {color = .orange;}  // Warning FPS
+    else if (fps < 15) color = .red;             // Low FPS
+
+    rl.drawText(rl.textFormat("%2i FPS", .{fps}), posX, posY, 20, color);
+}
+
+pub fn getFPS(fpsFrame : f32, frame : i32) i32 {
+    var fps : i32 = 0;
+
+    // if we reset the window, reset the FPS info
+    if (frame == 0)
+    {
+        average = 0;
+        last = 0;
+        index = 0;
+
+        for (0..FPS_CAPTURE_FRAMES_COUNT) |i| history[i] = 0;
+    }
+
+    if (fpsFrame == 0) return 0;
+
+    if ((rl.getTime() - last) > FPS_STEP)
+    {
+        last = @floatCast(rl.getTime());
+        index = (index + 1) % FPS_CAPTURE_FRAMES_COUNT;
+        average -= history[index];
+        history[index] = fpsFrame / FPS_CAPTURE_FRAMES_COUNT;
+        average += history[index];
+    }
+
+    fps = @intFromFloat(@round(1.0 / average));
+
+    return fps;
+}